/*
 *
 * This file is part of QMapControl,
 * an open-source cross-platform map widget
 *
 * Copyright (C) 2007 - 2008 Kai Winter
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with QMapControl. If not, see <http://www.gnu.org/licenses/>.
 *
 * Contact e-mail: kaiwinter@gmx.de
 * Program URL   : http://qmapcontrol.sourceforge.net/
 *
 */

#ifndef EMPTYMAPADAPTER_H
#define EMPTYMAPADAPTER_H

#include "qmapcontrol_global.h"
#include "mapadapter.h"

namespace qmapcontrol
{
//! MapAdapter which do not load map tiles.
/*!
 * The EmptyMapAdapter can be used if QMapControl should not load any map tiles. This is
 *useful if you only want to display an image through a FixedImageOverlay e.g.
 *	@author Kai Winter <kaiwinter@gmx.de>
 */
class QMAPCONTROL_EXPORT EmptyMapAdapter : public MapAdapter
{
    Q_OBJECT
public:
    //! Constructor.
    /*!
     * @param tileSize This parameter seems unnecessary for this type of MapAdaper on
     * first sight. But since this parameter defines the size of the offscreen image it
     * could be used for a little performance tuning (larger offscreen-images have to be
     * redrawed less times).
     * @param minZoom the minimum zoom level
     * @param maxZoom the maximum zoom level
     */
    EmptyMapAdapter(int tileSize = 256, int minZoom = 0, int maxZoom = 17);

    virtual ~EmptyMapAdapter();

    virtual QPoint coordinateToDisplay(const QPointF &) const;
    virtual QPointF displayToCoordinate(const QPoint &) const;

    qreal PI;

protected:
    qreal rad_deg(qreal) const;
    qreal deg_rad(qreal) const;

    virtual bool isTileValid(int x, int y, int z) const;
    virtual void zoom_in();
    virtual void zoom_out();
    virtual QString query(int x, int y, int z) const;
    virtual int tilesonzoomlevel(int zoomlevel) const;
    virtual int xoffset(int x) const;
    virtual int yoffset(int y) const;
};
}
#endif
